Insulator-supporting arm.



No. 700,570. Patented May 20, I902.

J. E. SHARPE.

INSULATDR SUPPORTING ARM.

(Application filed Dec. 26, 1901.) (No Model.)

ATTORNEY.

WITNESSES:

UNITED STATES PATENT OFFIcn.

JOHN E. SIIARPE, OF ONEIDA, NE\V YORK, ASSIGNOR OF ONE-HALF TO NEWTON I). BARTLE, OF GUILFORD, NEXV YORK.

INSULATORSUPPORTING ARM.

SPECIFICATION forming part of Letters Patent No. 700,570, dated May 20, 1902.

Application filed December 26, 1901. Serial No. 87,215. (No model.)

To all whmn it may concern.-

Be it known that I, JOHN E. SHARPE, a citizen of the United States, and a resident of Oneida, in the county of Madison, in the State of New York, have invented new and useful Improvements in Insulator-Supporting Arms, of whichthe following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the construction of the arm which is fastened transversely to an erected pole and supports on its top the insulators, which carry electric wires stretched across said arm.

The object of this invention is to provide an insulator-supporting arm which shall be superior in strength and durability, and shall present minimum surface for lodgment of snow and ice upon it, and shall alsoafford a convenient and permanent hold for the attachment of the insulator; and to that end the invention consists in the improved constructionof the insulatorsupporting arm hereinafter described, and set forth in the claims. V

In the accompanying drawings, Figure 1 is a side view of an insulator-supporting arm embodying myinvention. Fig. 2 is an end view of said arm detached from its supporting-pole. Fig. 3 is a vertical section on line XX in Fig. 1, and Fig. 4: is an inverted plan view of the aforesaid arm.

Similar letters of reference indicate corresponding parts. v

or represents the arm, which is fastened transversely to the erected pole P and carries upon itstop the insulator O, which latter is shown of the form described and claimed in my Letters Patent No. 679,5ei4,of July 30,1901;

but my present invention is not limited to the use of that or any other style of insulator. My present invention resides in the novel constructionof the supporting-arm 0., which I form of a prolonged plate of iron or steel, preferably formed by means of rolls of a rolling-mill, which produces a plate bent transversely and formed with a central seat or horizontal portion 1) and with parallel flanges o 0,

- depending from the edges of said central portion, and thus providing the arm a with a longitudinal cavity (1 in its under side. The

bottom of said cavity being open prevents water, snow, ice, and dust from collecting in the arm a. The flanges of that portion of the said arm which is attached to the pole P, I prefer to form vertical orparallel, as shown at c, to permit of readily placing in the cavity d a filling-block g and to allow the arm to be properly seated in the boxing orrecess e, cut into the side of the pole P, as shown in Fig. 3 of the drawings.

The arm a is attached to the pole P by means of bolts f, passing through perforations in the vertical portions of the flanges c and either screwed into the pole, as represented in Fig. 3 of the drawings, or passing through the pole and provided with nuts on their protruding ends. To prevent said vertical portions 0 of the flanges from being crushed inward by the pressure exerted thereon in tightening the bolts f, I interpose between them the aforesaid filling-block g, of suitable hard material, to effectually'stay the flanges. The flanges c c of the remaining or free end portions of the arm a I prefer to compress, so as to form them converging or inclined toward each other, and thus brace them.

In attaching to thearm a the insulator O of the form shown in Figs. 1 and2 of the draw= ings or of any other form requiring attaching-bolts h passing vertically through the said arm I place across the bottoms of the two flanges c c a bar or washer 11 and prefer ably provide the ends of said bar or washer with shoulders i t", which engage the outer sides of the flanges, as illustrated in Figs. 1 and 2 of the drawings. Said shoulders serve to lock the bar or washer on the arm a. The bars or washers 'i t' are perforated and receive through them the attaching-bolts h h, which pass through perforated feet on the legs Z Z, attached to the insulator and resting upon the seat or horizontal portion Z) of the arm a. The lowerends of the bolts hare screw-threaded and provided with nutsn, which bear on the under side of the bar or washert' and fasten the insulator to the arm.

hat I claim as my invention is 1. An insulator-supporting arm consisting of a prolonged metallic plate formed transversely with a horizontal central portion and with stiffening-flanges depending from the edges of said central portion, in combination with an insulator mounted on the horizontal central portion of the arm, bars disposed across the bottom of the arm and bearing on the bottom edges of the flanges, and bolts tying the insulator to said bars.

2. An insulator-supporting arm consisting of a prolonged metallic plate formed transversely with ahorizontal central portion and with longitudinal flanges depending from the edges of the central portion, bars disposed across the bottom of the flanges and provided with shoulders engaging the sides of the flanges, and bolts tying the insulator to said bars as set forth.

' 3. An insnlator-supporting arm consisting of a prolonged metallic plate formed transversely with a seat in its center and with longi- JOHN E. SHARPE. [n s.]

Witnesses:

CHARLES S. CAMPBELL, D. HEROKIELS. 

